namespace simgrid {
namespace smpi {
-std::map<std::string, std::vector<s_mpi_coll_description_t>> smpi_coll_descriptions(
+std::map<std::string, std::vector<s_mpi_coll_description_t>, std::less<>> smpi_coll_descriptions(
{{std::string("gather"),
{{"default", "gather default collective", (void*)gather__default},
{"ompi", "gather ompi collective", (void*)gather__ompi},